We have 2 separate Dev versions now. One with the custom FBW and one without the custom FBW. The installer only support the dev version without the custom FBW. So if you want the new autopilot system that they develop as well as full support with the TCA quadrant hardware, you can’t use the installer. You need to use the manual install of the dev version with custom FBW.
While using the installer straightaway would work with daily updates. It’s essential to delete the old install and do a fresh install of the latest version if you’re moving from different editions (eg. from Stable, to Dev, to Dev with Custom FBW) This is just to make sure you don’t have any garbage files coming from the older version screwing something up in the new installation.
The thing is, we don’t know how they actually do the installer, do they make a full uninstallation as part of the update process or they just overwrite whatever the old version has with the new version files. If it’s the former, then it’s all good. If it’s the latter, then that’s when issues start to come up. Until we know for sure, I think deleting old install and do a fresh reinstallation with the newer version is the safer way to do, even though it’s just a bit of a slight hassle if you do this practically every day.